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(physics, chemistry) atom
Understanding the structure of atoms is a fundamental part of physics.
radioactive material
Sufficient caution is necessary when handling radioactive materials.
number
Could you tell me your number?
radiation; emission
This area is off-limits due to high radiation levels.
to emit; to radiate
This radio is emitting music.
symbol, mark
What does this symbol mean?
chemistry (branch of natural science)
He is an expert in chemistry.
(physics) radioisotope (a radioactive isotope of an element)
This area is seriously contaminated with radioactive isotopes.
radioactive fallout
This area is affected by radioactive fallout from past nuclear tests.
an isotope
An isotope refers to elements with the same atomic number but different numbers of neutrons.
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